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A mobile device with multiple interfaces consumes more energy for scanning of available networks during handover compared with one having a single interface. As the number of available networks increases, the discovery and selection of an optimal network consumes much energy for scanning, therefore, reduces battery life time. To cope with such problems, we propose an energy efficient scanning scheme...
In cognitive radio network, two or more nodes need to establish a link on an available channel when they want to transmit a data. Rendezvous is a process that nodes explore the available channels to establish a link when a pair of nodes wants to communicate with each other. The method of finding a common channel is a challenging problem. To use of a dedicated control channel can be a solution to find...
Cognitive Radio (CR) technology has emerged as a suitable technology for providing a possible solution to the lack of the spectrum problem. For this, CR has to identify opportunistically and heuristically the available spectrum, in which primary users (PUs) do not exist on it. It is critical that the secondary users (SUs) use the vacant portions of the spectrum without causing a loss of efficiency...
Cognitive Radio (CR) technology has emerged as a way to improve the overall spectrum usage by exploiting spectrum opportunities in both licensed and unlicensed bands. The Medium Access Control (MAC) protocol in CR network should support interference control for Primary Users (PU) and collision avoidance amongst Secondary Users (SU). In this paper, we propose a scheduling scheme for CR MAC protocol...
Recently, handoff is a critical issue for stations in IEEE 802.11-based wireless networks. In order to provide VoIP (Voice over IP) and real-time streaming applications for stations, handoff mechanism must be provided for reducing latency and seamless communication. However, the IEEE802.11 standards handoff is not appropriate to supply their QoS, because it is based on a full-scanning approach. Full-scanning...
The unlicensed incumbents must be offered seamless communications on other unused channels in TV white space. It must provide communication processes among competing users through the proper allocation of available resources. It is important to quickly organize a new network connection or to join to a new network rapidly. In this paper, we studied the limitations of the current distributed beaconing...
WiMedia UWB MAC protocol defines to use wide bandwidth and low power to communicate data for high speed in short range. WiMedia UWB MAC configures a fully distributed beaconing network based on non-infrastructure and devices broadcast their beacons through each beacon slot in a superframe which is made up of 256 MAS. Due to changes in the propagation environment, mobility, or other effects, devices...
The convergent feature of traffic in wireless body area networks (WBANs) makes congestion in certain areas which are the place of events and/or the location of sensor nodes near a sink. Congestion brings packet loss, retransmission, and delay at the node and it also causes the consumption of additional energy. Therefore there is no doubt that congestion needs to be controlled efficiently. In this...
Existing routing protocols such as AODV were used to simplify the shortest path metric. It assumes that all link quality must be the same. It does not consider link quality such as bandwidth, packet loss rate, packet size, etc. Several performance metrics that consider different link quality for WMNs such as ETX and ETT. Although, these metrics can provide more effective performance than the hop count...
In expanded service area of wireless mesh network to support mobility of the mobile station research is recognized as an important issue. Due to the mobile station move frequently to changing the path, data loss and network performance degradation are often occur, such as the service broken. In the existing research of support mobility, the Layer 3 or mobility is required, but it may cause the backup...
Typically, sensor networks consist of fixed sensor nodes. Sometimes, creating such a fixed sensor networks could be a daunting task. Sensor nodes assume deploying a stationary sensor network over a dangerous area such as a battlefield. Even if an advanced method to make the deployment safer is used, diverse element will cause a coverage holes. Even though perfect coverage can be achieved initially,...
The Hybrid Wireless Mesh Protocol is a mesh routing protocol that combines the flexibility of on-demand routing with proactive topology tree extensions. The Wireless Mesh Network consists of mesh points and stations. Even if mesh points or stations have mobility, the path should be kept continuously. The Direction of present mobility research is achieved by research in a mobility of stations. In case...
The hybrid wireless mesh protocol is a mesh routing protocol that combines the flexibility of on-demand routing with proactive topology tree extensions. The wireless mesh network is consisted with mesh points and stations. Even if mesh points or stations have mobility, the path should be kept continuously. Direction of present mobility research is achieved research in mobility of stations. In case...
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